WASHINGTON (CNN) - Protesters gathered in downtown Washington Sunday to denounce the International Monetary Fund and World Bank during the two organizations' joint annual spring meetings.

About a hundred people marched from Dupont Circle to the IMF headquarters as delegates from around the world met inside to discuss the organizations' role in the global economy.

"We are here to protest the failed policies of the IMF and World Bank," said Lacy MacAuley, a spokesperson for the DC-based Global Justice Action group, which sponsored the demonstration.

MacAuley said the protest was aimed at the leaders of the G-20 nations, which recently pledged $1 trillion to increase the IMF's lending capacity.

"The G20 giving more money to the IMF and World Bank so they can keep doing what they're doing is like giving drugs to someone in rehab," MacAuley said.

Sunday's peaceful protest came a day after demonstrators clashed with police as they tried to march on the streets without a permit. One police officer was injured in the scuffle.

"Every once in a while you get a couple knuckleheads that try to do something less than legal, but we had no problems at all [today]," said DC police captain Jeffrey Herold.

Despite Sunday's relative calm, the weekend did not go without incident. An ATM was vandalized in Georgetown during a protest walk Saturday evening, Herold said.

Six people were also arrested earlier Saturday for vandalizing two commercial bank branches in downtown Washington. Police said the suspects were believed to be possibly connected the IMF protest groups.